JP2015151925A5

JP2015151925A5 -

Info

Publication number: JP2015151925A5
Application number: JP2014026235A
Authority: JP
Filing date: 2014-02-14
Publication date: 2016-05-26

Description

上記目的を達成するため、請求項１に記載の発明では、回転駆動されて空気流を発生する軸流式の送風ファン（４０）と、送風ファン（４０）に吸込される空気の吸込口部（３２）と、送風ファン（４０）から空気を吹き出す吹出口部（３１）とが形成されたシュラウド（３０）とを備え、送風ファン（４０）は、回転中心に設けられるボス部（４１）から放射状に延びるとともに、回転方向に相互に離間して配設された複数のブレード（４２）と、複数のブレード（４２）の外周端部同士を周状に接続するリング部（４３）とを有しており、送風ファン（４０）の回転軸の軸方向からみたときに、送風ファン（４０）における回転軸の径方向の外側端部からシュラウド（３０）の外周縁部（３００）までの回転軸の径方向の距離を外周距離としたとき、外周距離が、回転軸の周方向で変化している送風装置において、シュラウド（３０）のうち、外周距離が他の部位より最も短い部位には、回転軸の軸方向の長さよりも回転軸の周方向の長さが長いスリット状の貫通孔（３５、３６）が設けられており、貫通孔（３５、３６）は、シュラウド（３０）のうちブレード（４２）の空気流れ方向の上流側縁部（４２０）よりも空気流れ上流側部位、および、シュラウド（３０）のうちブレード（４２）の上流側縁部（４２０）よりも空気流れ下流側部位の少なくとも一方に配置されていることを特徴とする。 In order to achieve the above object, according to the first aspect of the present invention, the axial blower fan (40) that is driven to rotate to generate an airflow, and the air inlet port that is sucked into the blower fan (40) are provided. (32) and a shroud (30) formed with a blowout port (31) for blowing air from the blower fan (40), and the blower fan (40) is a boss part (41) provided at the center of rotation. A plurality of blades (42) that extend radially from each other and spaced apart from each other in the rotational direction, and a ring portion (43) that circumferentially connects the outer peripheral ends of the plurality of blades (42). And when viewed from the axial direction of the rotary shaft of the blower fan (40), from the radially outer end of the rotary shaft of the blower fan (40) to the outer peripheral edge (300) of the shroud (30). The radial distance of the rotating shaft is the outer peripheral distance When the outer peripheral distance in air blower is changed in the circumferential direction of the rotating shaft, of the shroud (30), the shortest site of the outer peripheral distance other sites than the axial length of the rotary shaft Slit-like through holes (35, 36) having a long circumferential length of the rotating shaft are provided, and the through holes (35, 36) are arranged in the air flow direction of the blade (42) of the shroud (30). It is arranged at least one of the upstream part of the air flow from the upstream edge part (420) and the downstream part of the shroud (30) from the upstream edge part (420) of the blade (42). It is characterized by that.

このとき、貫通孔（３５、３６）を回転軸の軸方向の長さよりも回転軸の周方向の長さが長いスリット状とすることで、貫通孔（３５、３６）からシュラウド（３０）内の空気通路に流入する空気の流速を増大させることができる。このため、シュラウド（３０）のうち外周距離が他の部位より短い部位から送風ファン（４０）へ流入する空気の流速を増大できるので、吸込空気の偏流による騒音の増大をより確実に抑制できる。 At this time, the through hole (35, 36) is formed in a slit shape in which the circumferential length of the rotation shaft is longer than the axial length of the rotation shaft, so that the through hole (35, 36) is inserted into the shroud (30). The flow rate of air flowing into the air passage can be increased. For this reason, since the flow velocity of the air which flows into a ventilation fan ( 40 ) from a site | part whose outer periphery distance is shorter than another site | part among shrouds (30) can be increased, the increase in the noise by the drift of suction air can be suppressed more reliably.

Claims

An axial blower fan (40) that is rotationally driven to generate an airflow;
A shroud (30) formed with an air inlet port (32) sucked into the blower fan (40) and an outlet port (31) for blowing air from the blower fan (40) ;
The blower fan (40)
A plurality of blades (42) extending radially from a boss portion (41) provided at the center of rotation and spaced apart from each other in the rotational direction;
A ring portion (43) that circumferentially connects the outer peripheral ends of the plurality of blades (42);
When viewed from the axial direction of the rotating shaft of the blower fan (40), the outer end portion (300) of the shroud (30) from the radially outer end of the rotating shaft of the blower fan (40). When the distance in the radial direction of the rotating shaft is the outer peripheral distance,
The outer peripheral distance is a blower that changes in a circumferential direction of the rotating shaft,
Of the shroud (30), the part having the shortest outer peripheral distance than the other part has a slit-like through hole (35 having a longer length in the circumferential direction of the rotating shaft than in the axial direction of the rotating shaft. 36) are provided,
The through-holes (35, 36) are formed in the shroud (30) in the air flow upstream portion of the blade (42) in the air flow direction in the air flow direction (420), and in the shroud (30). Of these, the air blower is arranged in at least one of the downstream portions of the air flow with respect to the upstream edge (420) of the blade (42).

The said through hole (35) is arrange | positioned among the said shrouds (30) in the air flow upstream site | part rather than the said upstream edge part (420) of the said blade (42), The Claim 1 characterized by the above-mentioned. The blower described.

The through-holes (35, 36) include a portion of the shroud (30) upstream of the upstream edge (420) of the blade (42) and an air flow upstream portion of the blade (42), and the blade of the shroud (30). The air blower according to claim 1, wherein the air blower is disposed at both of the upstream side edge portions (420) of the air flow downstream side portion (42).

The blower fan (40) has a flange portion ( 44 ) connected to an upstream end portion in the air flow direction of the ring portion ( 43 ) and extending radially outward of the blower fan,
The through hole (35, 36), the air flow than the flange portion (44) of said flange (44) air flow upstream position than, and said shroud (30) of the shroud (30) The flange portion (44) is sandwiched between one and the other of the through holes (35, 36) in the axial direction of the rotating shaft by being disposed at two locations on the downstream side portion. The air blower according to claim 1.

The said through-hole (35) is arrange | positioned only in the air flow upstream site | part rather than the said upstream edge part (420) of the said blade (42) among the said shrouds (30). The blower described in 1.

The said through-hole (36) is arrange | positioned only in an air flow downstream site | part rather than the said upstream edge part (420) of the said blade (42) among the said shrouds (30). The blower described in 1.